Ionic contribution to the dielectric properties of a nematic liquid crystal in thin cells

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Abstract

We report measurements on dielectric properties of a nematic liquid crystal in planar aligned cells with two different thicknesses (1.2 and 6.7 μm). The nematic has a wide thermal range and the temperature variation of the effective dielectric constant (∈⊥) of the thick cell reflects that of the orientational order parameter. On the other hand, the thin cell exhibits a higher value of ∈⊥ which is essentially temperature independent. We have conducted detailed dielectric measurements in the frequency range of 10 Hz-1.1 kHz on both the cells and analyzed the data using a simplified model which takes into account the ionic contribution. It leads to an estimation of the temperature dependencies of the number density and diffusion coefficient of the impurity ions. © 2001 American Institute of Physics.

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Dhara, S., & Madhusudana, N. V. (2001). Ionic contribution to the dielectric properties of a nematic liquid crystal in thin cells. Journal of Applied Physics, 90(7), 3483–3488. https://doi.org/10.1063/1.1388163

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